BOMCO F-1300 - Cylinder Head Flange; Welding and Repairs; Welding Procedures

Instruction Manual for F1300/1600 Mud Pump
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3.9.4 Cylinder Head flange
A replaceable cylinder head flange (9) is screwed on the face of the cylinder blocks. The flange must
make up metal-to-metal with face of cylinder blocks in order for the axis vertical of the end face and
cylinder. Therefore, make sure all burrs, extrusions, or foreign matter removed from the mating faces
before installing.
NOTE: When install the flange, make sure the “bleed hole” is in the down position. Tighten the nuts
(10) with the torque values shown in table 6.
Table 6
Position ITEM
TORQUE
N.m
TORQUE
ft. lbs
TO THE FRAME 2 2170 1600
SUCTION MANIFOLD 5 325 240
DISCHARGE MANIFOLD 8 1355 1000
CYLINDER HEAD FLANGE 10 2170 1600
3.10 Welding and Repairs
On occasion where washouts or normal wear cause repairs to be made to the fluid end bores, the
following welding procedures and precautions should be closely followed. Machine bore all dimensions
to those shown in applicable table 5 and in any case maintains the shoulders (install liners, valve
covers, and cylinder head etc.) seat 90°to the axis of the bore.
3.10.1 Welding Procedures
Weld repairs can usually be separated into two categories: (1) Washouts, (2) Cracks. Listed below is
the basis information for the repairs:
1) Washouts:
z Weld as 30# carbon Steel
z Clean area by grinding or Arc-air
z Before starting any welding procedure, make sure the electrodes are dry of moisture, and if
necessary, put in oven and dry it.
z Spot heat area to 120°-180°C (250°-350°F) out in all directions for a minimum of 75mm(3”)
z Use AWS-ASTM E-60-7018 low hydrogen rods.
z Example: ADAM-Arc 7018.
z Temperatures should be brought back to 120°-180°F (250°-350°C) after each pass and
maintained throughout the welding. After welding is completed and area cleaned, heat to 120°-180°C
(250°-350°F) and allow cooling naturally.
2) Cracks:
z Grind out all of cracks by mechanical method. Any attempt to eliminate a crack using air cut will
only result in the crack progressing faster than the material can be burned.
z Preheating: